98lincmk7lsc
Dedicated LVC Member
2 12w7's in a vented box should definitely get you your 140db's, depending on how much power you're putting to them.
My first Mark VIII had 2 12w7's in a sealed box (1.5 cubic ft for each sub). With a JL 1000/1 amp powering EACH sub (2 total), I metered at 143db's. That was also with both amps turned nearly all the way down.
My current setup metered at 136.x recently. Just 1 12w7 with a 1000/1 amp (also turned down) and a slot-vent box...
My first Mark VIII had 2 12w7's in a sealed box (1.5 cubic ft for each sub). With a JL 1000/1 amp powering EACH sub (2 total), I metered at 143db's. That was also with both amps turned nearly all the way down.
My current setup metered at 136.x recently. Just 1 12w7 with a 1000/1 amp (also turned down) and a slot-vent box...